STS fails to start after installing extensions on OSX

[aphahn]

I'm using:
OS X 10.5.8 with a case sensitive file system
Java(TM) SE Runtime Environment (build 1.6.0_15-b03-226)

I have installed STS from:
springsource-tool-suite-2.2.1.RELEASE-e3.5.1-macosx-carbon-installer.dmg
springsource-tool-suite-2.2.1.RELEASE-e3.5.1-macosx-cocoa-x86_64-installer.dmg
springsource-tool-suite-2.2.1.RELEASE-e3.5.1-macosx-carbon.tar.gz

After installing STS I install the Groovy and Grails extensions and restart STS.
STS fails to open and pops up a dialog referring me to a log file which contains:

!SESSION Thu Nov 26 17:44:07 MST 2009 ------------------------------------------
!ENTRY org.eclipse.equinox.launcher 4 0 2009-11-26 17:44:07.261
!MESSAGE Exception launching the Eclipse Platform:
!STACK
java.lang.ClassNotFoundException: org.eclipse.core.runtime.adaptor.EclipseStarter
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:316)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:556)
        at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1311)

The diff (diff -rq springsource springsource2) of the directories before installing the extensions and after is (springsource2 is the clean install):

Only in springsource: .DS_Store
Only in springsource/sts-2.2.1.RELEASE/STS.app/Contents/MacOS: sts.ini
Files springsource/sts-2.2.1.RELEASE/artifacts.xml and springsource2/sts-2.2.1.RELEASE/artifacts.xml differ
Files springsource/sts-2.2.1.RELEASE/configuration/.settings/org.eclipse.ui.ide.prefs and springsource2/sts-2.2.1.RELEASE/configuration/.settings/org.eclipse.ui.ide.prefs differ
Files springsource/sts-2.2.1.RELEASE/configuration/config.ini and springsource2/sts-2.2.1.RELEASE/configuration/config.ini differ
Files springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.core.runtime/.manager/.fileTable.7 and springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.core.runtime/.manager/.fileTable.7 differ
Files springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.core.runtime/.manager/.fileTable.8 and springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.core.runtime/.manager/.fileTable.8 differ
Files springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.core.runtime/.table.1 and springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.core.runtime/.table.1 differ
Only in springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi: .bundledata.1
Only in springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi: .bundledata.2
Only in springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/.manager: .fileTable.4
Files springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/.manager/.fileTable.5 and springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/.manager/.fileTable.5 differ
Only in springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/.manager: .fileTable.6
Files springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/.state.1 and springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/.state.1 differ
Files springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/347/data/SCR and springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/347/data/SCR differ
Only in springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/365/data: -57300181
Only in springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/365/data: 1553553669
Files springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/372/data/cache.timestamps and springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/372/data/cache.timestamps differ
Files springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/372/data/listener_1925729951/artifacts.xml and springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/372/data/listener_1925729951/artifacts.xml differ
Files springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/372/data/listener_1925729951/content.xml and springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/372/data/listener_1925729951/content.xml differ
Files springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/372/data/timestamps-897699915 and springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/372/data/timestamps-897699915 differ
Only in springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles: 377
Only in springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/381/data: -1187023094
Only in springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/381/data: -839923540
Only in springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/427/1/.cp/org/eclipse/jface/dialogs/images: help.gif
Only in springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles: 543
Only in springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/666/1/.cp/icons/full/dlcl16: progress_stop.gif
Only in springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.osgi/bundles/666/1/.cp/icons/full/elcl16: progress_stop.gif
Files springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.update/install.log and springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.update/install.log differ
Files springsource/sts-2.2.1.RELEASE/configuration/org.eclipse.update/platform.xml and springsource2/sts-2.2.1.RELEASE/configuration/org.eclipse.update/platform.xml differ
Only in springsource/sts-2.2.1.RELEASE/features: com.springsource.sts.grails_2.2.1.200910210131-RELEASE
Only in springsource/sts-2.2.1.RELEASE/features: org.codehaus.groovy.eclipse.feature_2.0.0.xx-20091108-2000-e35
Only in springsource/sts-2.2.1.RELEASE/features: org.codehaus.groovy.jdt.patch_2.0.0.xx-20091108-2000-e35
Only in springsource/sts-2.2.1.RELEASE/features: org.codehaus.groovy16.feature_2.0.0.xx-20091108-2000-e35
Only in springsource/sts-2.2.1.RELEASE/features: org.codehaus.groovy17.feature_2.0.0.xx-20091108-2000-e35
Files springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.engine/profileRegistry/com.springsource.sts.ide.profile/.data/.settings/org.eclipse.equinox.p2.artifact.repository.prefs and springsource2/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.engine/profileRegistry/com.springsource.sts.ide.profile/.data/.settings/org.eclipse.equinox.p2.artifact.repository.prefs differ
Files springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.engine/profileRegistry/com.springsource.sts.ide.profile/.data/.settings/org.eclipse.equinox.p2.metadata.repository.prefs and springsource2/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.engine/profileRegistry/com.springsource.sts.ide.profile/.data/.settings/org.eclipse.equinox.p2.metadata.repository.prefs differ
Only in springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.engine/profileRegistry/com.springsource.sts.ide.profile/.data/.settings: org.eclipse.equinox.p2.ui.sdk.prefs
Files springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.engine/profileRegistry/com.springsource.sts.ide.profile/.data/.settings/org.eclipse.equinox.p2.ui.sdk.scheduler.prefs and springsource2/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.engine/profileRegistry/com.springsource.sts.ide.profile/.data/.settings/org.eclipse.equinox.p2.ui.sdk.scheduler.prefs differ
Only in springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.engine/profileRegistry/com.springsource.sts.ide.profile: 1259282188939.profile.gz
Only in springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.engine/profileRegistry/com.springsource.sts.ide.profile: 1259282190952.profile.gz
Only in springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.engine/profileRegistry/com.springsource.sts.ide.profile: 1259282620776.profile.gz
Only in springsource2/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.engine/profileRegistry/com.springsource.sts.ide.profile: 1259283337909.profile.gz
Only in springsource2/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.engine/profileRegistry/com.springsource.sts.ide.profile: 1259283339243.profile.gz
Only in springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.repository/cache: compositeContent1095413072.jar
Only in springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.repository/cache: compositeContent1300562221.jar
Only in springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.repository/cache: content-1313268167.jar
Only in springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.repository/cache: content-1964146205.jar
Only in springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.repository/cache: content-445678946.jar
Only in springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.repository/cache: content-485972093.jar
Only in springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.repository/cache: content-836065428.jar
Only in springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.repository/cache: content-888347553.jar
Only in springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.repository/cache: content1048691197.jar
Only in springsource/sts-2.2.1.RELEASE/p2/org.eclipse.equinox.p2.repository/cache: content816442617.jar

I removed all the diffs for files in springsource/sts-2.2.1.RELEASE/plugins as it made the post to long.

Any ideas on how to get it working?